G4NCE's Vintage Military Wireless Collection

RT-44/PPN-1A

 


 

 

This is a rare American WWII Eureka Beacon. The equipment would be set up on the ground, generally taken in by parachute, and would be used with the airborne Rebecca homing equipment to guide an aircraft to the Dropping Zone (DZ). The RAF also had a British-made Eureka system.
RT-44/PPN-1A Station

The complete station - less carrying bag. Top left is the battery box (this set came to me with the PPN-1 battery box - see later for the PPN-1A battery box), centre is the vibrator PSU and right is the radio transceiver. Channel selection is achieved by mechanically varying the core position in two coils (Tx / Rx) under the chassis using a 'click-stop' type mechanism.  The antenna comprises a sectional mast, with a ground-plane antenna fixed to the top - the PPN-1 had a 75 Ohm feeder and the PPN-1A a 50 Ohm feeder. The ground-plane has two elements in the lower half.


Radio ID platePSU ID plate

Ident plates off the top of the radio and PSU cases.
 

Radio front panel

Radio front panel showing the power input connector top left, headphone socket (standard 1/4") under the cover top right, on/off switch, pressel switch and Tx (left) and Rx (right) channel selection knobs. These would be set to the Tx and Rx channel detailed in the operation's schedule on navigation aids order, examples for D-Day are here.


Radio rear panel

Radio rear panel showing the cap(marked  DEST ) which covered the explosive mechanism - which would be used to destroy the radio when neccessary. The tube containing the explosive can be seen under the capacitors attached to the centre shield below.
Radio internal

Internal view of the radio.
 

Explosive cert

The certificate pasted to the side of the radio which indicates that the explosive charge has been removed....
 

Pics from the manual

Drop bag and batteries 

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